Mixing-slab.



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. APPLICAT .5. me. 1,218,327. Patented Mar. 6, 1917.

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WITNES I INVENTOI? V A 7TOR/VEY8 ARTHUR SHORROCK, OF NORTH ADAMS, MASSACHUSETTS.

MIXING-SLAB.

Specification of Letters Patent.

Patented Mar. 6, 1 917.

Application filed January 5, 1916. Serial No. 70.427.

To all whom it may concern:

Be it known that I, ARTHUR Suouuoqk, a citizen of the United States, and a resident of North Adams, in the county of Berkshire and State of Massachusetts, have invented certain new and useful Improvements in Mixing-Slabs, of which thefollowing is a specification.

My invention relates to dental mixing slabs whereon it is desired to mix certain materials at a predetermined temperature, and the main object thereof is to provide self-contained means in such slabs for determining the temperature thereof.

The mamifacturers of certain compounds, particularly dental cements, demand that their products be mixed for use at a certain temperature in order to attain the best results, and this requires that the mixing slab used by dentists for mixing the powder into paste form just previous to use shall be at the desired temperature but no means for determining whether or not the slab is at the desired temperature are now obtainable, and it was in order to fill this want that my invention was conceived.

My invention is fully described in the following specification, of which the accompanying drawings form a part, in which like characters refer to like parts in each of the views, and in which Figure 1 is a top, plan view of a mixing slab constructed in accordance with my invention; and Fig. 2 is a section taken on the line 22 of Fig. 1.

.My invention comprises a slab-3 of transparent material, such as glass or the like, of a suitable thickness insuring immunity from easy breakage, provided with a groove 4 in .the under side thereof to receive a mercury tube 5 in such a manner as to be readable from the upper side of the slab and be protected against accident at the under side thereof.

The tube may be cemented in the groove 4 of held therein in any desired manner. and a scale may be engraved or otherwise applied in or on the upper surface of said slab to form a thermometer with the tube 5.

I may also provide. a recess in the under side of the slab to receive a combined thermometer and scale, this not being illustrated however, or I may combine the slab and thermometer in any other desired manner provided that it may be read at the upper surface of said slab. i

In practice theslab is chilled ocheated to the desired temperatifre as indicated by 'the thermometer, as by immersion in cold or hot water, after which the slab is ready for mixing. the material of which the slab is formed holding this temperature for a sul'liciently long time to attain the best results with the material being mixed. but I do not limit myself to any specific material, nor to any particular form. I

Having fully described my invention, what I claim as new and desire to secure by Let ters Patent. is

A dental mixing slab provided with a. groove in the under side thereof of relatively small length and width and of relatively great depth whereby said slab will not be materially weakened by said groove, a mercury tube in said groove adjacent the upper surface of said slab, and means for sealing said tube in said groove, said slab being provided with a scale adjacent said tube to form a thermometer therewith.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR SHORROCK.

Vitnesses A. E. Srnxcnn, V. H. PurrcnAm). 

